ACR Electronics SmartReader Plus Bedienungsanleitung PDF herunterladen (Seite 23)

SmartReader Data Logger

1.4

SmartReader 2 Temperature & Humidity Logger

A self-contained "air-quality" logger, the SmartReader 2 can be used easily in a wide variety of

applications to collect temperature and relative humidity data.

Figure 2-1: SmartReader 2

1.4.1 Description

The SmartReader 2 includes an on-board thermistor temperature sensor and a plug-in RH

Sensor plus two input channels for an optional remote temperature and relative humidity

probe.

How It Works

The relative humidity sensor in the SmartReader 2 is a processed plastic wafer. This wafer is

actually a laser-trimmed, capacitive thin-film relative humidity sensor.

Changes in relative humidity cause the surface capacitance of the polymer film to vary. The

SmartReader 2 gauges this capacitance by passing a small electric current through it and

measuring the relative voltage drop. Because the response of the sensor is temperature

dependent, a temperature reading is always taken at the same time as the humidity reading.

That way, when the logger's information is backed up into your computer, TrendReader

software can automatically factor in the right compensation values when it calculates the

percentage of Relative Humidity (in % RH). The result is an accurate set of

automatically-generated and temperature-compensated relative humidity readings.

1.4.2 Setup

Make sure to enable each channel you want to use. If you are not using a channel, disable it

to save logger memory.

Channel

Description

Equation

Internal Temperature

Internal Relative Humidity

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 102 103

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ACR Electronics SmartReader Plus Bedienungsanleitung Seite 23